ORCID Profile
0000-0002-3287-9377
Current Organisations
McGill University
,
Universiteit Utrecht
,
University of Oxford
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Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 02-2006
Publisher: IEEE
Date: 2005
Publisher: Optica Publishing Group
Date: 11-07-2005
Abstract: This paper presents an all-optical, in-band optical signal-to-noise ratio (OSNR) and chromatic dispersion monitor. We demonstrate monitoring over the 1 nm bandwidth of our signal, which is a 10 GHz pulse train of 8.8 ps pulses. The monitor output power, as measured on a slow detector, has a 1.9 dB dynamic range when the signal OSNR is varied by 20 dB, and a 1.6 dB dynamic range when +/- 150 ps/nm of chromatic dispersion is applied. Cascaded four-wave mixing occurring in the optical parametric lifier provides the nonlinear power transfer function responsible for the monitoring. An analysis using the signals' probability density functions show that the nonlinear power transfer function provides preferential gain to clean undispersed pulses when compared to noisy and/or dispersed pulses. Our analysis includes a consideration of the applicability of the device to high duty cycle systems, and simulations on monitoring of a 40 Gb/s pulse train with a 50% duty cycle.
Publisher: Optica Publishing Group
Date: 11-2005
DOI: 10.1364/OL.30.002900
Abstract: We report a fully integrated, passive, all-optical regenerator capable of terabit per second operation, based on a highly nonlinear chalcogenide (As2S3) glass rib waveguide followed by an integrated Bragg grating bandpass filter. We demonstrate a clear nonlinear power transfer curve with 1.4 ps optical pulses, capable of improving the signal-to-noise ratio and reducing the bit error rate for digital signals.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2005
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2006
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2006
Publisher: SPIE
Date: 09-02-2006
DOI: 10.1117/12.648768
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TC02856H
Abstract: Electrochemically bridging the gap between metallic IDE fingers at the percolation threshold for highly sensitive chemiresistors on PET flexible substrates.
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1RA03648C
Abstract: Reversible NO 2 sensing by controlling the balance of oxidised and over-oxidised PEDOT.
Publisher: OSA
Date: 2018
Publisher: American Chemical Society (ACS)
Date: 07-03-2022
Publisher: Optica Publishing Group
Date: 2006
DOI: 10.1364/OE.14.010371
Abstract: We present the first demonstration of all optical wavelength conversion in chalcogenide glass fiber including system penalty measurements at 10 Gb/s. Our device is based on As2Se3 chalcogenide glass fiber which has the highest Kerr nonlinearity (n(2)) of any fiber to date for which either advanced all optical signal processing functions or system penalty measurements have been demonstrated. We achieve wavelength conversion via cross phase modulation over a 10 nm wavelength range near 1550 nm with 7 ps pulses at 2.1 W peak pump power in 1 meter of fiber, achieving only 1.4 dB excess system penalty. Analysis and comparison of the fundamental fiber parameters, including nonlinear coefficient, two-photon absorption coefficient and dispersion parameter with other nonlinear glasses shows that As(2)Se(3) based devices show considerable promise for radically integrated nonlinear signal processing devices.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 08-2005
Publisher: AIP Publishing
Date: 18-06-2018
DOI: 10.1063/1.5023163
Abstract: Au thin films of thicknesses ranging from 5 to 20 nm were grown in UHV through physical vapour deposition on glass substrates decorated with Pt interdigitated electrodes with 5 μm separation. As expected, a gradual decrease in the electrical resistance of the films was observed as growth proceeded however, when the average film thickness was greater than around 11 nm, the resistance decrease was not smooth but occurred in discrete steps. These resistance steps are attributed to the formation of electrical percolation pathways connecting the electrodes. The s les were then annealed at temperatures between 200 °C and 500 °C for periods of 1 to 22 h with the aim of producing insulating nanoparticle films. Dewetting of the Au films produces nanoparticles whose size and separation depend on annealing temperature and time, as well as the initial thickness of the Au film. The complex electrical resistance behaviour of the film was also monitored during the dewetting process.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2006
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0AN02403A
Abstract: Ammonium nitrate mixed with fuel oil (ANFO) is commonly used in improvised explosive devices (IEDs). The development of ANFO vapour sensors that are small, inexpensive, and easy to use will enable widespread IED detection in the context of security and humanitarian demining. Because of concealment and the low vapour pressures of most explosive materials, achieving sufficiently high sensitivity and low limits of detection are some of the main challenges of explosives vapour detection. Here ANFO chemiresistive vapour sensors based on polypyrrole (PPy) percolation networks are presented and compared to gas chromatography-mass spectroscopy (GC/MS) results for ANFO. Improved sensitivities are achieved by using a polymer percolation network instead of a thin film for the gas sensors. Vapour concentrations are detected of 13-180 ppb of ammonia emitted by a variety of different ammonium nitrate-containing fertilisers and fertiliser-diesel mixtures.
Publisher: Optica Publishing Group
Date: 2005
Abstract: A bandpass optical filter, based on fiber Bragg gratings, is presented in which the bandwidth of a Gaussian spectrum can be continuously adjusted, whilst maintaining near zero group delay slope over the filter bandwidth. The device is also wavelength tunable and the spectral profile is selectable by appropriate grating design. This novel device is employed in a 2R-regenerator, enabling data rate reconfiguration and wavelength conversion, with negligible phase distortion. It will find application wherever a dispersionless reconfigurable bandpass optical filter is required.
Publisher: SPIE
Date: 08-02-2007
DOI: 10.1117/12.717377
Publisher: Elsevier BV
Date: 09-2006
Publisher: Optica Publishing Group
Date: 2006
DOI: 10.1364/OE.14.006414
Abstract: We demonstrate that an optical regenerator architecture providing re- lification, re-shaping, and re-timing based on the principle of spectral shift followed by filtering can lead to bit error ratio improvement of the signal passing through it. This is in contrast with typical regenerators based on the usual principle of power conversion from a transfer function, which are unable to improve the bit error ratio. At first, we provide the theoretical basis that explains this improvement. Then we present the regenerator architecture based on spectral shift followed by filtering and provide experimental evidence of bit error ratio improvement of a noisy signal from 3x10(-6) without regenerator to 2x10(-10) with regenerator.
Publisher: The Optical Society
Date: 27-09-2017
Publisher: OSA
Date: 2010
Publisher: Optica Publishing Group
Date: 20-10-2006
DOI: 10.1364/AO.45.007904
Abstract: We present a detailed analysis of a 2R optical regenerator based on self-phase modulation in As(2)Se(3) chalcogenide glass fiber using frequency-resolved optical gating (FROG). We obtain good agreement between the FROG measurements and theory, and confirm that the output pulses are near-transform limited. We show that two-photon absorption improves the profile of the power transfer function while not degrading the temporal performance.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 02-2022
Publisher: OSA
Date: 2017
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Martin Rochette.